Introduce a wayland/x11 mutter hints protocol for monitor labels #5580

Job	Run time
fedora	1m 11s
lint	10s
build-and-test (stable)	57s
open-suse-leap	2m 3s
build-and-test (unstable)	1m 0s
build-and-test (development-target)	53s
	6m 14s

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